1,4-butanedithiol is a super potent mix, much worse than butanethiol, IMHO. I was doing organosulfur chemistry so I was used to bad smells. This one was off the charts for me. Dimethyl sulfoxide fascinated me, it actually has no smell when pure, it sublimes readily, but it reverts to small impurities of dimthehyl sulfide, which does smell, and sulfone, which does not, rather quickly.
My great discovery was a reaction that runs in circles, for a while. It's of no practical use. The conditions reduce a sulfoxide to a sulfide and then oxidize the sulfide back to a sulfoxide. My boss wanted me to reduce sulfones, but no dice.